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| author | Daniel Borkmann <dborkman@redhat.com> | 2013-11-12 23:45:42 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-11-14 16:06:02 -0500 |
| commit | 0125737accc5aac532719aecd80615364caa9e0f (patch) | |
| tree | 2f592b7a2597b93ad262945d3deca0d169ef5e1b /lib | |
| parent | 66b251422be7cb39e7619fee647724720f74d1f7 (diff) | |
| download | linux-0125737accc5aac532719aecd80615364caa9e0f.tar.gz linux-0125737accc5aac532719aecd80615364caa9e0f.tar.bz2 linux-0125737accc5aac532719aecd80615364caa9e0f.zip | |
random32: use msecs_to_jiffies for reseed timer
Use msecs_to_jiffies, for these calculations as different HZ
considerations are taken into account for conversion of the timer
shot, and also it makes the code more readable.
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/random32.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/lib/random32.c b/lib/random32.c index 4f9d5dffc554..1e5b2df44291 100644 --- a/lib/random32.c +++ b/lib/random32.c @@ -214,18 +214,22 @@ static DEFINE_TIMER(seed_timer, __prandom_timer, 0, 0); static void __prandom_timer(unsigned long dontcare) { u32 entropy; + unsigned long expires; get_random_bytes(&entropy, sizeof(entropy)); prandom_seed(entropy); + /* reseed every ~60 seconds, in [40 .. 80) interval with slack */ - seed_timer.expires = jiffies + (40 * HZ + (prandom_u32() % (40 * HZ))); + expires = 40 + (prandom_u32() % 40); + seed_timer.expires = jiffies + msecs_to_jiffies(expires * MSEC_PER_SEC); + add_timer(&seed_timer); } static void __init __prandom_start_seed_timer(void) { set_timer_slack(&seed_timer, HZ); - seed_timer.expires = jiffies + 40 * HZ; + seed_timer.expires = jiffies + msecs_to_jiffies(40 * MSEC_PER_SEC); add_timer(&seed_timer); } |